In the rich text editor:
@Silvesary
In a comment:
[Silvesary](https://chowlings.com/user/Silvesary)
For Names and Avatars:
In the rich text editor:
%Silvesary
In a comment:
[](https://chowlings.com/user/Silvesary) [Silvesary](https://chowlings.com/user/Silvesary)